Scaling Behavior of Current- Voltage Characteristics of Y1-xCaxBa2Cu3O7- Polycrystalline Samples
نویسنده
چکیده
I-V characteristics of polycrystalline Y1-xCaxBa2Cu3O7samples (x=0.025 and 0.20) have been measured at different temperatures and magnetic fields in the range 0.1 T-6.9 T. The scaling behavior has been established for both samples at all magnetic fields. The dynamic exponent z displays some morphology dependence with higher value for small grain size sample Y0.8Ca0.2Ba2Cu3O7. The static exponent has been determined from vs. T dependence at given magnetic field. The critical exponents are field independent with one only exception ( for Y0.975Ca0.025Ba2Cu3O7sample). This is connected with the special interrelation between the vortex correlation length, , and intervortex spacing ( ) at all magnetic fields above Tg for this sample and its better pinning.
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